[Help] Mu Core 1.0.8 password case sensitive

Hi I need some help. I think my problems is simple but I cant figure out how to fix it or find a solution in the forum. The problem is that my website allows me to login with my username and password no matter if I type them in lowercase or uppercase. At first I thought it was the database but in the Game the username and password are case sensitive. Please help! Thank you in advance

and whats the problem with that?
u dont want case sensitive? i prefer it... cuz if my account is Karlitaki and then another comes with karlitaki but different account and one day i made mistake trying to login with 'karlitaki' and made a whole chaos cuz i forgot its not with capitals.

hmm.