What is your status stars count?
Post your Training page screenshot so we can see full description and Training Pacer.
Form is changing hour to hour which is represented as a gradient line on the Planner.
It is not uncommon for calculated form to move from red (v. tired) to blue (fresh) within hours.
It depends on the dosage of low/high/peak strain from the completed activity and your current status stars count (TL).
The higher your TL the faster you recover especially if a HIT workout is short.
With sufficient strain the recovery pattern will be red (v. tired) to yellow (tired) to blue (fresh) and finally to green (v. fresh) if additional rest occurs before the next actiivity.
The FF slider only affects the suggested list at the time. For example, today my calculated form (at this time) is fresh but I’m not up for a HIT workout. I can slide towards left (red) and the list should show easier workouts. Try slamming the slder to the left if you aren’t seeing that.
The swing in XSS deficit/surplus is a combination of how it’s caculated (moving weighted average over a rolling 7-day window) and how XATA considers your weekly pattern (what you usually ride on this day of the week). Sounds confusing until you get used to how it works. 
Then the goal becomes keeping the Training Pacer needle within the 11am-1pm position to maintain the improvement rate you’ve set (which you can change at any time).
Reference –
- I had an XSS Training Surplus of X yesterday but today I have a big deficit of Y. What’s going on? – Xert
- Recommended XSS – Xert
- Xert Training Pacer – Xert
- Training Status and Form – Xert
Lots of newbie tips posted here – Onboarding steps for Xert trial users and newbies - General - Xert Community Forum
Welcome aboard. 