Retirement tax questions

Thanks.
New problem--I think I took out too much RMD. I had asked the brokerage retirement dept. for help calculating it, not trusting myself.

I now have used their calculator and it seems that I took out over twice what I should have. Possibly the brokerage person didn't take into account that the date of death was pre-2019, even though they asked the date of death, and I told them.

 

Should I mention this mistake I made in the letter to the IRS, or wait to hear what they say? Can I get in trouble for accidentally taking out too much? (I assume that I still owe the excise tax on the amount I took out, unless they waive it).