It’s important to remember that variation in your credit score between monitoring services is completely normal.
There are a variety of scoring models that may cause variation in your score. For example, both Mint and Credit Karma use the VantageScore 3.0 model.
The FICO Score provided in your Grow Credit account uses the FICO Score 8 based on Equifax reporting. You can find more information about the FICO Scoring versions here.
Each credit bureau will offer different results, based on what information is in your credit file and how the scores are computed.