And for most... it is better to today delete old logo pic and wait 24 hrs to upload new pic...
Same thing happens with forts and placing up a new pic up on fort... (and later on i never cleared cache before retry... delete old, set new it up tmrw works)... i came up to a conclusion it isn't my pc issue (or my browser), but game delay issue..
EDIT: Clearing cache didn't work on upload of new pic for forts