Some users have reported that their NFT's cost basis is not being tracked correctly due to listing/delisting activity.

Since the NFT can leave and enter back into the wallet during listing/delisting, that can disrupt how the cost basis is being tracked before being officially sold.

Users who engage with Tensor Swap.

You can upvote this forum post to indicate you are experiencing this behavior. The post status will be changed to once a fix is rolled out to all users. Up-voters will be notified of the status change.