Is there any way to fix a tracked route when you have power saving on your android phone?

Hello.

I did a very long walk the other day and tracked it on Strava. As my phone was dying (this is what I use to track, no smart watches) I put my Samsung phone into "power saving" mode from the phones drop down menu. I didn't realise this would impact my strava tracking but it limits the locational data.

Strava has gone mental and my 20-25km walk has now registered as a 64km walk. I have tried deleting segments, following online instructions, but it says there are no segments to delete.

Does anyone have any ideas how I can fix this, even so that its vaguely right. I track all my activities but this was a special walk for me and I'm truly gutted that I don't have any usable tracking information. Thanks.