LaTeX 中的 TikZ 中的“every”是否会改变形状？

Question

我读过蒂克兹pdf 文件，其中有时用于every定义样式，但有时不定义。经过比较every或没有every，我发现形状发生了变化。例如：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary {arrows.meta,petri,positioning}
\begin{document}
\begin{tikzpicture}
[node distance=1.3cm,on grid,>={Stealth[round]},bend angle=45,auto,
every place/.style= {minimum size=6mm,thick,draw=blue!75,fill=blue!20},
every transition/.style={thick,draw=black!75,fill=black!20},
red place/.style= {place,draw=red!75,fill=red!20},
every label/.style= {red}]
\usetikzlibrary {arrows.meta,petri,positioning}
\node [place,tokens=1] (w1) {};
\node [place] (c1) [below=of w1] {};
\node [place] (s) [below=of c1,label=above:$s\le 3$] {};
\node [place] (c2) [below=of s] {};
\node [place,tokens=1] (w2) [below=of c2] {};
\node [transition] (e1) [left=of c1] {}
edge [pre,bend left] (w1)
edge [post,bend right] (s)
edge [post] (c1);
\node [transition] (e2) [left=of c2] {}
edge [pre,bend right] (w2)
edge [post,bend left] (s)
edge [post] (c2);
\node [transition] (l1) [right=of c1] {}
edge [pre] (c1)
edge [pre,bend left] (s)
edge [post,bend right] node[swap] {2} (w1);
\node [transition] (l2) [right=of c2] {}
edge [pre] (c2)
edge [pre,bend right] (s)
edge [post,bend left] node {2} (w2);
\end{tikzpicture}
\begin{tikzpicture}
[node distance=1.3cm,on grid,>={Stealth[round]},bend angle=45,auto,
place/.style= {minimum size=6mm,thick,draw=blue!75,fill=blue!20},
transition/.style={thick,draw=black!75,fill=black!20},
red place/.style= {place,draw=red!75,fill=red!20},
every label/.style= {red}]
\usetikzlibrary {arrows.meta,petri,positioning}
\node [place,tokens=1] (w1) {};
\node [place] (c1) [below=of w1] {};
\node [place] (s) [below=of c1,label=above:$s\le 3$] {};
\node [place] (c2) [below=of s] {};
\node [place,tokens=1] (w2) [below=of c2] {};
\node [transition] (e1) [left=of c1] {}
edge [pre,bend left] (w1)
edge [post,bend right] (s)
edge [post] (c1);
\node [transition] (e2) [left=of c2] {}
edge [pre,bend right] (w2)
edge [post,bend left] (s)
edge [post] (c2);
\node [transition] (l1) [right=of c1] {}
edge [pre] (c1)
edge [pre,bend left] (s)
edge [post,bend right] node[swap] {2} (w1);
\node [transition] (l2) [right=of c2] {}
edge [pre] (c2)
edge [pre,bend right] (s)
edge [post,bend left] node {2} (w2);
\end{tikzpicture}

\end{document}

输出：

这很奇怪，因为没有every将圆形变成正方形。