Mods wont install to the Server

I am currently using 1.7.10 on the server to play mods. but none of the mods will actually install. I have no clue why they arent installing and i was wondering if anybody had an answer. thank you

they are not in the file section. when i click to install, it starts installing and it says that it is installed. but after a few seconds the checkmark disappears again. i have even tried other mods but none work.

i tried a different browser. same thing

(it was always offline) well at first i tried to install the decimation mod for my server. that didnt work. then i tried MorePlayerModels, didnt work either. then i just tried some random mod (i dont remember wich) and that didnt work either.

im using chrome atm.

i dont quite follow what you mean by "tick".

just found out that when i generated a world it didnt arrive in the save folder.

yes it turns into a tick. but after a few seconds the tick disappears again and turns back into the download icon.

if you mean my username for the server. Its "PRIVATEBOI"

now the mods are in the folder but i dont get the tick icon for some reason