Has anyone else ever finished and sent their taxes only to find out that it never received?

[Sssongbird123]

I had two returns in 2019 and 1 of my 2020 no send and this last one cost me thousands in penalty because i owed.  One sent but somehow the second did not.  And i know i hit the send button.  Not impressed.  Went to H&R Block.  It turns out its cheaper by far than the cost of the mistakes.  I will never do my own taxes again.  And the penalty for being late by almost a year was huge.   A very dissatisfied ex-customer.