The Instructions for form 5498 for 2019 (probably the same every year) are at the bottom...
Rollovers are not taxable and frequently administrators do not send out 1099-Rs. Therefore, they normally do not affect your tax return (the 5498 itself is informational in nature and does not get entered on your tax return).
From a tax point of view, there is no problem, but as a taxpayer, I would be curious who was putting money into my accounts (it's probably an innocent explanation).
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Box 2. Rollover Contributions
Enter any rollover contributions (or contributions treated as rollovers) to any IRA received by you during 2021. These contributions may be any of the following.
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A 60-day rollover between Roth IRAs or between other types of IRAs.
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A direct or indirect (within 60 days) rollover from a qualified plan, section 403(b) plan, or governmental section 457(b) plan.
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Any qualified rollover contribution, as defined in section 408A(e) from an eligible retirement plan (other than an IRA) to a Roth IRA.
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A military death gratuity.
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An SGLI payment.
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