TSS issue

TSS isn't based on average power, it's based on normalized power. If you did some hard efforts in that ride it's perfectly possible to have 161 average watts, 124 TSS (which isn't a recovery ride) and sore legs. Check what it has for FTP, if that's wrong TSS will be wrong. Even if the FTP value is correct it might not be "correct". Have you done a test in the last few months? 

tks for taking the time to have a look at my issue ;o)

I have my FTP setting on all the time and it's currently at 246W. This being said, there is no way I could maintain 246W over an hour but that's the Garmin calculation.

That's the article I read about TSS that got me onto the 124TSS support.garmin.com/.../

The following is better advise as to TSS levels since it includes consideration of current fitness, i.e. Chronic Training Load (CTL). But note that even the lowest suggested TSS level for a ride is for an "easy" workout which is not the same as a recovery ride, which would be lower still.

https://www.trainingpeaks.com/blog/applying-the-numbers-part-2-training-stress-score/

The idea of FTP being the max power you can hold for an hour is an oversimplification and misreading of what Andy Coggan originally proposed for FTP. Any person's FTP is that power he or she can hold for a reasonably long period, 30 to 70 minutes, before fatigue causes a notable fall-off in power, the time period being defined by where that inflection point of where that power drop-off is. Coggan used the hour mark as an example, he didn't mean it to be an absolute but that's what it became. As such TSS isn't really that useful since it is based on the presumption everyone can hold their FTP for exactly 1 hour..

As an example, my FTP is 252 but my time to exhaustion (TTE) at FTP is 49 minutes, that's where my inflection point is. So when the TSS formula calculates what the stress, or TSS, of any ride is it is understating the physiological stress I actually incurred (it assumed I could hold 252 for 60 minutes, not 49). That being said, since I know it is always off by the same amount (assuming my FTP and TTE remain the same, which they don't, of course) it does give a very general idea as to the variance in ride stress from one day to the next. Just don't get too wrapped up in the actual number or use yours to compare to anyone else.