It is not illegal to combine information from multiple Form 1098s and make one entry for the multiple forms. Form 1098 is an informational form and the data, if required, is used to prepare your tax return.
This TurboTax link What do I do if I have multiple 1098s from refinancing my home debt? has directions on multiple 1098's
The IRS Publication 936 (2021), Home Mortgage Interest Deduction has information you may find useful.
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