Immediate Past Category
Besides the numerous comments on the translations in the immediate past, the category itself seems to be frozen at 4/5. No matter how many times I strengthen the category - even with no errors - it does not change to 5/5.
The /5 is based on individual word strengths so it may be that your practices have not given you the particular word in that skill that is stopping it from being 5/5
To resolve this you could go back a redo every lesson to ensure you are strengthening each word in the skill.