You can have 3 different credit scores from three credit bureaus, and they will typically vary due to the various calculations that each of them uses.
Some bureaus will have access to credit information that others don’t have. The number of hard inquiries on your credit report will be a factor in determining your credit score, and some of the bureaus may not have access to all of them.
In the end, each bureau uses the same scoring system, but they all have different info at their disposal, resulting in a score that can fluctuate between each of them.