Air carrier Captain reported there is a discrepancy between the ILS and PAPI for ILS 14 at SHV that is not noted on the approach plate or NOTAMs.

Narrative

On a visual approach backed up by the ILS 14 I (PF) stated in my brief that if we were able to accept a visual approach I would verbally state when I switched to using the PAPI lights for vertical guidance instead of the ILS glidepath. After we were stabilized at 1000 feet I switched to PAPI guidance and announced as such to the PM. Shortly afterward we received a glideslope warning and I noticed a discrepancy of 1.5 dots low. Despite being on the PAPIs I elected to continue the approach but flew a slightly higher approach than what the PAPIs were showing (approximately 1 dot low on the ILS glideslope). Crossing the threshold the radar altimeter called 30 feet when I was expecting to hear the 50 feet call. Nowhere on the approach plate does it state the ILS glidepath and PAPIs were not coincident. Cause: The ILS and PAPIs are not coincident but it is not noted on the approach plate. Suggestions: Either fix the ILS and PAPIs to make them coincident; place a note on the approach plate; or NOTAM the PAPI out of service until it can be aligned with the PAPIs.