Good day, we have problem with signature

when we create email we see full signature, but when we go to sent folder we see piace of it.

Console log get warnings to Mixed Content: The page at '<URL>' was loaded over HTTPS, but requested an insecure image '<URL>'. This content should also be served over HTTPS. but early it not take any affect, we dont change anything.

i clear cache

update chrome

logining in mozilla in incognito but problem not solved

Please help with this issue