Strange IE restriction on the number of external CSS

While developing the project, I came across a strange glitch in IE. Some styles just didn't apply to the page. Because the project is large and there are many styles, at the stage of CSS development it was divided into many files for each logically separate block. Finding out the reason, I, empirically, came to the conclusion that IE loads a maximum of 31 external CSS file through. The remaining files are simply ignored.
Checked for IE6 and IE7.

Naturally, when the site goes into production all the CSS will be in one file, but at the development stage this moment set up the bandwagon.