Running the same workflow action can cost different amounts of Workload Units (WUs) at different times. This is because Bubble caches many operations behind the scenes — when cached data is available, a workflow runs faster and uses fewer WUs. Occasionally the cache needs refreshing, and when that happens the same workflow runs without cached data and costs slightly more.
What you might notice
The same workflow action shows different WU costs at different times
A workflow action you expect to cost a certain amount occasionally costs more
Workaround
No action is needed — this is expected behavior and works in your favor. The WU costs published in Bubble's documentation represent the non-cached (higher) cost. In practice, most workflow runs use cached data and cost less than the documented amount.