Simple. For so many years, FDOT had it posted along there to US-17, instead of over to I-95.
If you change the dates on the GSV imagery you linked to to Aug '19, you can clearly see a 'NORTH' banner above the FL-105 shield.
I also see that they removed the 'SOUTH' shield
here in the
2023 imagery.
However, before I made any changes, I'd love conformation that
this signage has changed as well, not directing people to the left to continue on FL-105.
Also would love to see them change this
'NORTH' shield to add a 'TO' as well along US-17, since that's the only way you can access NB FL-105.