/32 Network not getting Visible to remote end

Dear Experts,

Experiencing a problem on Fortigate 90D while advertising route under eBGP.

We are configuring a network on MPLS cloud. There are Four remote locations. Let say A, B , C ,D.

We are advertising /32 network under eBGP at our end (Site A) but same is not getting visible at remote end(Site B) fortigate 90D.

However, Site-B end /32 advertised network are getting visible at our end (Site-A).

Additionally, When we are advertising /24 pool at Site-A...Same is visible at remote end fortigate (Site-B). But /25 , /26 , /27, /28, /29, /30 , /32 is not getting learned at remote end (Site-B).

Pls suggest what could be the issue.

Regards