It's false!
Is your Tails Electrum in persistent volume?
If yes, try to check if there's more than one wallet file(s) in the default wallet directory or any location that you've previously selected.
If there were, try to open them one by one, you may have used another wallet file for those "
lost" transactions.
Guid 2.e.:
If the seed was originally generated in Electrum its possible you may have been affected by a file corruption bug.Yes, I was effected by a file corruption bug! -snip-
Does your wallet notified you about a possible corruption or an error message?
Because most of the time, if you still successfully launched the wallet it will detect any corruption to the wallet file.
If there's a major corruption, it wont open at all.
Maybe BitMaxz is correct (
Post above),
If you don't mind, can you share the receiving addresses of those two transactions?
Or at least tell us if they are still
unspent.