Incorrect calculation of word width in PDF

I have a PDF that does WinAnsiEncoding(Times)

, and it doesn't have any encoding toUnicode

or differences. When I try to select or highlight text, the text width is not calculated correctly.

I have all the widths, but somehow the width is calculated incorrectly.
What could be the problem?
How can I get the correct CID of a character to find the correct glyph width?
I have screenshots for the same. " EXPLANATION " the word is not fully selected. This can only happen if the glyph width is calculated incorrectly.