Did you receive a 1099-R for that rollover? Your eligible contributions may be reduced by any recent distributions you received from a retirement plan or IRA. However, rollovers that are not taxable should not do this - is your 1099-R taxable by some chance? You would need to see why that is.
Also there is an income limit over which you receive zero credit. For married filing joint, it is $63,000 or for any other status, it is $31,500.
See https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-savings-contributions-save...
