space added to long strings at arbitrary positions

[gm9]

The site is adding spaces to long words and I do not understand the logic behind it. Below are four separate lines of exactly the same length as examples. The space it added by the site when you display the post. Interestingly the position of the space depends on the characters in the string:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A

BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBB

12345678901234567890123456789012345678901234567890123456789012345678901234567890 12345678901

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX X