ok so thats not alot of code for that webpage even though it has hardly anything there definitely is lack of code. is your gmail link https or http?
ok so with the problem page open click the 3 line button on the right and highlight the help and click report issue. Just detail explain the problem and show the snap shot that it takes so google can help you. Their support is 24/7 and they should have a solution to the problem. Sorry I couldn't find a better solution.