I went to the Electrum.org site for the download. When I purchased the bc I was asked to enter the wallet address. I put in the 1N8vh.... address on the top of the wallet.
What is the timeline here? How soon before your first withdrawal from Coinmama did you set up the Electrum wallet?
I ask because the first transaction to that address was on April 20th, 2021. However, approximately one month earlier, Electrum released version 4.1.0 which stopped generating legacy seed phrases and legacy addresses (without going through the console) and started generating segwit seed phrases and segwit addresses instead. Such addresses would start with "bc1", and not look like the legacy address which you have shared.
I think the download and the first purchase were close together. Certainly not nearly a month apart. Me being the dullard I am, perhaps I clicked on a download link that had not been updated. I don't know. I remember it being a 3. something version. When this problem started I upgraded to the 4.3.4 version hoping that might "fix" something. Your colleague on here, LoyceV, feels I may have changed something at the time of the initial purchase. They may be right. I can't categorically deny that. It seems I've broken/manipulated it beyond repair.