The case i have is an official Samsung case (not aftermarket). As dumb as it might sound i didn't look if the lightning icon is on the battery when noticing that it doesn't charge..will take a look. As for the placement on the pad, i tried both vertically and horizontally and making sure it's touching everywhere.
Thing is, even if it's not charging, the device is getting warm. Sometimes it charges fast, sometimes in 30 min it does just 2%.
I will try to go to my local Samsung store tomorrow with my S8 and the charging pad...they told me it doesn't take long to test. This way maybe i will find out if it's something wrong with the S8 itself (which i heavily doubt) or there's an incompatibility issue or something else. Hope they atleast experienced similar stuff with other S's.
I will write back here after i find out what's wrong and how it gets fixed (if it gets fixed).
Thank you very much everyone for jumping in and posting, you were helpful