Workaround:

Instead of using g++-11 compiler you should install and use g++-9 and re-compile from scratch. There's obviously going something wrong when using version 11. But Version9 works!!!

Code:

$ ./VanitySearch -check

Quote

$ ./VanitySearch -check
GetBase10() Results OK
Add() Results OK : 400.000 MegaAdd/sec
Mult() Results OK : 48.077 MegaMult/sec
Div() Results OK : 15.152 MegaDiv/sec
R1=1000003D1
R2=1000007A2000E90A1
Field characteristic size: 256bits
ModInv()/ModExp() Results OK
ModInv() Edge cases Results OK
.Avg = 6.13
ModInv() Results OK : 929.515 KiloInv/sec
ModInv() cycles : 2685.26
ModSqrt() Results OK !
IntGroup.ModInv() Results OK : 12.757 MegaInv/sec
ModMulK1() Results OK : 47.549 MegaMult/sec
ModSquareK1() Results OK : 53.285 MegaSqr/sec
ModInv() Cost : 114.7 S
ModMulK1order() Results OK : 8.427 MegaMult/sec
Check Generator :OK
Check Double :OK
Check Add :OK
Check GenKey :OK
Adress : 15t3Nt1zyMETkHbjJTTshxLnqPzQvAtdCe OK!
Adress : 1BoatSLRHtKNngkdXEeobR76b53LETtpyT OK!
Adress : 1Test6BNjSJC5qwYXsjwKVLvz7DpfLehy OK!
Adress : 16S5PAsGZ8VFM1CRGGLqm37XHrp46f6CTn OK!
Adress : 1Tst2RwMxZn9cYY5mQhCdJic3JJrK7Fq7 OK!
Adress : 3CyQYcByvcWK8BkYJabBS82yDLNWt6rWSx OK!
Adress : 31to1KQe67YjoDfYnwFJThsGeQcFhVDM5Q OK!
Adress : bc1q6tqytpg06uhmtnhn9s4f35gkt8yya5a24dptmn OK!
Check Calc PubKey (full) 1ViViGLEawN27xRzGrEhhYPQrZiTKvKLo :OK
Check Calc PubKey (even) 385cR5DM96n1HvBDMzLHPYcw89fZAXULJP:OK
Check Calc PubKey (odd) 18aPiLmTow7Xgu96msrDYvSSWweCvB9oBA:OK
GPU: GPU #0 NVIDIA GeForce RTX 3070 Laptop GPU (40x128 cores) Grid(320x128)
Seed: 1663082517
1.553 GigaKey/sec
ComputeKeys() found 7711 items , CPU check...
^C

and the calculated pub addresses are correct now. I'm happy so far Cool