I noticed that if I import data (specifically from Fidelity) a second, third, etc. time and uncheck, on the summary screen, the lines data for accounts that I imported from before, the program deletes those accounts' data. I unchecked the data info from those accounts in order to avoid a duplication, but the program is dumb enough that it deletes already transferred data if they were unchecked.
Whoever who is in contact with TurboTax designers please pass my message to them or prove that I am wrong. I did loose data from my main Fidelity account when I was later importing data from my other accounts there. And I discovered it at the end, when summary of my filling was produced.
"Trust but verify. "
Thank you.