Hi, are you using https://blurtwallet.com (which works for me) or another one? I checked on the block explorer https://blocks.blurtwallet.com/#/@gduran and did not see any suspicious activity like changing keys.
Do not hesitate to ask for help in the helpdesk channel of the Blurt Discord server https://discord.blurt.world/
I just tried and I was able to login, perhaps it is a computer problem.