1. Sounds like the script is resetting aggro. It will do that around every 10 minutes if it isnt currently in combat. If it happens more frequrently than that please save the logs (using the buttons at the bottom of the osbot client) and DM me what the logs say. I guess if you have lower stats you might have not killed every crab walking around by then, but it will still reset if it is not currently under attack since its just more efficient to have a lot of crabs attacking you instead of clearing out every crab that isnt even targetting you.
2. When you want to use progressive mode you have to select both the skill to train and the goal at which level to stop. If you dont select a goal the script thinks the task is done, so it will return to bank and prepare for the next task.
Skill to train tells the script which attackstyle to use, the goal settings are used to decide when the task is done.
If you have any further issues or questions feel free to just dm me the settings you use and the output in the logger and I will help you out