Huge number for N struct vbe_conn

[Cloude Porteus]

The vbe_conn is flickering between 0-2 and 18446744073709551615. See
varnishstat below.

Any ideas what might cause this?

7+02:38:17
squid02.instructables.com
Hitrate ratio:       10       53       53
Hitrate avg:     0.9901   0.9921   0.9921

   216720678       264.96       352.79 Client connections accepted
   216720561       263.96       352.79 Client requests received
   210371940       262.96       342.46 Cache hits
     3969778         1.00         6.46 Cache hits for pass
     2353478         0.00         3.83 Cache misses
     6348344         1.00        10.33 Backend connections success
          21         0.00         0.00 Backend connections failures
         505          .            .   N struct sess_mem
           9          .            .   N struct sess
      882772          .            .   N struct object
      877128          .            .   N struct objecthead
     1821113          .            .   N struct smf
       47639          .            .   N small free smf
          53          .            .   N large free smf
18446744073709551615          .            .   N struct vbe_conn
         236          .            .   N struct bereq
         400          .            .   N worker threads
         405         0.00         0.00 N worker threads created
         181         0.00         0.00 N overflowed work requests
           1          .            .   N backends
     1392097          .            .   N expired objects
    15124429          .            .   N LRU moved objects
         269         0.00         0.00 HTTP header overflows
   178241867       249.96       290.16 Objects sent with write
   216720668       270.96       352.79 Total Sessions
   216720576       270.96       352.79 Total Requests
       18741         0.00         0.03 Total pipe
     4054622         2.00         6.60 Total pass
     6328784         7.00        10.30 Total fetch
 99334274932    126775.84    161703.99 Total header bytes
1050072439149   1016298.38   1709388.84 Total body bytes
   216720649       270.96       352.79 Session Closed
         106         0.00         0.00 Session herd
 10383942441     12795.97     16903.78 SHM records
   874958544      1081.83      1424.32 SHM writes
        4880         0.00         0.01 SHM flushes due to overflow
       18440         0.00         0.03 SHM MTX contention
        4265         0.00         0.01 SHM cycles through buffer
    12403028        13.00        20.19 allocator requests
     1773421          .            .   outstanding allocations
 16170405888          .            .   bytes allocated
 37516685312          .            .   bytes free
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