Your issue seems different from mine. You could try entering as if you have only one 1098, which seems to be the primary workaround for multiple 1098 issues. Use mortgage balance at beginning of year (old loan). Then add interest paid from both 1098s for Box 1 input. Same for any other amounts eg property insurance etc.
There are other posts that give such workaround instructions in more detail. It seems to be a known bug in this product that appears to have existed before this year. I expect better than workarounds.
