It can be a bit of a minefield I'm afraid.
When DVD-R/RW first came out it had only two recording standards.
DVD-R recordings are usually made in standard DVD Video mode. This is still the most compatible, because once the disc is finalised the disc structure is identical to a commercial DVD.
DVD-RW can use two modes however, you can record in the standard video mode and also in DVD-RW VR mode. The majority of players can happily read a -RW disc if it is recorded in Video mode once the disc is finalised, but even after all these years of it being available most won't read -VR mode discs.
DVD+R/RW discs are different though, both use the DVD+VR mode instead. This is different again from the two modes that -R/RW discs use. The structure of +VR discs is generally more compatible with standard DVD players than -VR discs but there is still no guarantee that +RW discs can be read by another player.
Just to confuse matters EVEN more, some recorders use the + (plus) VR mode for recordings, even those made on -(minus) R/RW media (My Liteon recorder does this for example).
To ensure your discs are as compatible as possible use either DVD-R/+R discs and finalise after recording. The vast majority of players will happily play them, but even then, it may handle -R media better than +R or vice versa.
Some players are also fussy about the brand of media you used to record on.
I personally find that DVD-R recording on my Liteon are, for some odd reason, more compatible with other players than DVD+R media even though the recorder uses the DVD+VR mode when recording on -R media.
Told you it was confusing
Try recording it again on DVD-R
W Ron.