K1 for Publicly Traded Partnership (PTP) shows different cost basis than my brokerage.

I have K1s for PTPs that I held in two different accounts.

The cost basis provided by the brokerages and the non adjusted cost basis provided on the K1 are wildly different. I'm assuming these are different because of some combinations of 1. wash sales 2. using different lot selection 3. brokerages only considering shares from that account vs. K1 looking at all shares.

Is it a problem that the original cost basis on the K1 does not match my 1099?

When I use the cumulative adjustment to cost basis to adjust my cost basis, should I be using the cost basis on the K1 or the cost basis from my brokerage?

Some of these sales were wash sales. If I have to change the cost basis does this affect the wash sale amounts at all?

Thank you!!