Hi SteBae
We have several release channels (Alpha, Beta, Stable) and staged rollout which means only a specific percentage of users receive a specific version. This means not all users will receive all versions so there might be an gap between the changelog version (which is always updated) and the Google Play version.
As an example we are currently rolling out version 2.68.606 at 25% in Stable channel. Within this week the percentage will increase to 100% so that all users will receive an update to this version.
Best regards
Boris