Quicken & Internet Explorer: syncing issues with random reconciled transactions

I just went to sync my quicken accounts with several banks.  I received error code OL-220-A on one and had several transactions with another that were either eliminated from one bank (Marcus) and completely different reconciled transactions for (Ally) that are not accurate.  Completely messed up my balances.   I validated my data and nothing is showing up.  I spoke to one bank (Veritex) that says that quicken is using internet explorer and it is not working correctly since most banks no longer support internet explorer.  Can anyone explain this?  I spent hours finding numerous errors in my balances. 

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