Just to confirm, have you tried changing your channel icon by following the steps mentioned in our Help Center resource: https://goo.gl/ZSSoSB . Also, mind sharing your channel URL with us? Keep us posted.
Noted. As a next step, can you send us a feedback report on this with these steps: https://goo.gl/1ckkO5 ? While every individual report may not get a direct response, we do review everything and use the details to investigate and fix any issues.