I guess the wizard wipes out the dvr/log directory? (Where all the info for recordings is stored.)
Tvheadend does not scan the recording directory for recordings, it does the opposite - it reads info for each recording from the dvr/log directory then checks if the file exists.
You might have some old recordings saved in the backup directory?? (/home/hts/.hts/tvheadend/backup/)
You may look at this thread to see about "importing" the recordings back into the configuration.
https://tvheadend.org/d/6579-recovering-from-disk-failure?r=37226#message-37226
In the future, I would not use the wizard to reconfigure your system, probably better to learn how to manually make the changes you need.
You could also make a "feature request" to ask that the wizard does not wipe out the dvr/log files. Or at least backs up the old configuration before wiping it out (if it does not already do that...)