This is extremely unlikely. After 1 block confirmation, trying to spend the same transaction but with a higher fee will not work, unless that block gets orphaned. According to https://www.blockchain.com/explorer/charts/n-orphaned-blocks the last time there was an orphaned block was in June 2017. I doubt anyone would be lucky enough to find 67, transfer it to their wallet with 1 block confirmation, and then unlucky enough to have that block immediately orphaned and replaced by another block where someone else has replaced the transaction. But no matter which method is used, it's a good idea to have additional signed & ready to broadcast higher-fee transactions on hand, or transactions spending different inputs, just in case you have to use them. You can create different feerate transactions in Electrum, and then sign them once you import the WIF private key.

Also, if you're using Mara, its a good idea to make your feerate much higher than the minimum shown on their website. Sometimes it can be many hours between blocks mined by Mara, and if the regular mempool gets congested during that time and the minimum fee goes up, so will Maras, and if your transactions feerate is below the new minimum, it might not get mined into their next block. I once had a transaction stuck in Mara for 2 days because I set my fee to what was shown on Maras website at the time I submitted the transaction, and the network got congested, and Mara mined a few blocks that didn't include the transaction that I submitted to them earlier. Just set your feerate extremely generous to be safe.