我目前正在制作一个包含引文的演示文稿，在某些时候，LaTeX（或者更确切地说是 BiBTeX）将所有 BibTeX 键链接到同一个参考文献，所以现在它看起来像这样：
显然，这些参考文献中只有一个应该是 Carvalho et al. 2010，其他所有参考文献都有其他 bibtex 条目，这些条目具有唯一且不同的 bibtex 键。事实上，即使我重新编译一些一周前编译得很好的旧演示文稿，这种行为现在也很奇怪。这是一个 MWE：
\documentclass[t,aspectratio=169]{beamer}
%% PACKAGES
\usepackage{graphicx}
\usepackage{array,multirow}
\usepackage{float}
\usepackage{xcolor}
\usepackage{amsbsy}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{amssymb}
\usepackage{natbib}
\usepackage{bbm}
%\usetheme[style=free]{wu}
\title[Title]{\textbf{Title}\\ Subtitle}
\author[Author]{Mr Author}
\date{June 26, 2020}
\institute[]{University}
\beamerdefaultoverlayspecification{<+->}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\section{Statistical model and shrinkage estimation}
\begin{frame}
\frametitle{Shrinkage methods}
\begin{itemize}
\item Many options for shrinkage priors: Bayesian Lasso \citep{Park2008}, spike-and-slab (two-component discrete mixture prior by \cite{Mitchell1988} and \cite{George1993}), Normal-Gamma prior \citep{Griffin2010}, Horseshoe \citep{Carvalho2010}, \cite{Piironen2017}
\end{itemize}
\end{frame}
\beamerdefaultoverlayspecification{<.->}
\begin{frame}[allowframebreaks]
\frametitle{References}
\scriptsize
\bibliographystyle{apa}
\bibliography{BE_I_Bib}
\normalsize
\end{frame}
\end{document}
相应的.bib 文件（BE_I_Bib.bib）如下所示：
% Encoding: UTF-8
@Article{Park2008,
author = {Trevor Park and George Casella},
journal = {Journal of the American Statistical Association},
title = {The Bayesian Lasso},
year = {2008},
number = {482},
pages = {681-686},
volume = {103},
date = {2008},
journaltitle = {Journal of the American Statistical Association},
}
@Article{George1993,
author = {George, E. I. and McCulloch, R.E.},
journal = {Journal of the American Statistical Association},
title = {Variable selection via Gibbs sampling},
year = {1993},
number = {423},
pages = {881-889},
volume = {88},
}
@Article{Mitchell1988,
author = {T. J. Mitchell and J. J. Beauchamp},
journal = {Journal of the American Statistical Association},
title = {Bayesian Variable Selection in Linear Regression},
year = {1988},
issn = {01621459},
number = {404},
pages = {1023--1032},
volume = {83},
publisher = {[American Statistical Association, Taylor & Francis, Ltd.]},
url = {http://www.jstor.org/stable/2290129},
}
@Article{Griffin2010,
author = {Griffin, Jim E. and Brown, Philip J.},
journal = {Bayesian Anal.},
title = {Inference with normal-gamma prior distributions in regression problems},
year = {2010},
month = {03},
number = {1},
pages = {171--188},
volume = {5},
doi = {10.1214/10-BA507},
fjournal = {Bayesian Analysis},
publisher = {International Society for Bayesian Analysis},
url = {https://doi.org/10.1214/10-BA507},
}
@Article{Carvalho2010,
author = {Carlos M. Carvalho and Nicholas G. Polson and James G. Scott},
journal = {Biometrika},
title = {The horseshoe estimator for sparse signals},
year = {2010},
issn = {00063444},
number = {2},
pages = {465--480},
volume = {97},
url = {http://www.jstor.org/stable/25734098},
}
@Article{Piironen2017,
author = {Piironen, Juho and Vehtari, Aki},
journal = {Electron. J. Statist.},
title = {Sparsity information and regularization in the horseshoe and other shrinkage priors},
year = {2017},
number = {2},
pages = {5018--5051},
volume = {11},
doi = {10.1214/17-EJS1337SI},
fjournal = {Electronic Journal of Statistics},
publisher = {The Institute of Mathematical Statistics and the Bernoulli Society},
url = {https://doi.org/10.1214/17-EJS1337SI},
}
@Comment{jabref-meta: databaseType:bibtex;}
我尝试了所有简单的方法：设置一个新的演示文稿和新的 bibtex 文件，更新所有软件包，在不同的软件（TeXStudio 和 TeXworks）甚至不同的操作系统（Windows 和 Linux）中进行编译，但没有任何效果，只要至少有两个参考文献，所有引用都会与同一参考文献相关联，无论使用什么 Bibtex 键。我只找到了一种手动解决问题的方法，即更改 .aux 文件中的以下部分：
\bibstyle{apa}
\bibdata{BE_I_Bib}
\bibcite{Carvalho2010}{{1}{2010}{{Carvalho et~al.}}{{}}}
\bibcite{George1993}{{2}{2010}{{Carvalho et~al.}}{{}}}
\bibcite{Griffin2010}{{3}{2010}{{Carvalho et~al.}}{{}}}
\bibcite{Mitchell1988}{{4}{2010}{{Carvalho et~al.}}{{}}}
\bibcite{Park2008}{{5}{2010}{{Carvalho et~al.}}{{}}}
\bibcite{Piironen2017}{{6}{2010}{{Carvalho et~al.}}{{}}}
问题显然出在这里，但我不知道为什么。我手动将错误分配的“Carvalho et~al.”替换为每个 bibtex 键对应的正确作者姓名。这在一次编译中有效，但只要我更改某些内容，所有内容都会再次被错误分配，我必须从头开始。任何帮助都非常感谢！