Memcached Increase Jump problem

i use the couchbase 4.5 community ver and Couchbase.NetClient2.2.6.0

I am using the ulong variable in Memcached in an incremental fashion.
but today situation,

IncrementAsync(“SomeKey”);
101
IncrementAsync(“SomeKey”);
102
IncrementAsync(“SomeKey”);
103
IncrementAsync(“SomeKey”);
7907544
IncrementAsync(“SomeKey”);
27627417
IncrementAsync(“SomeKey”);
27627418
IncrementAsync(“SomeKey”);
27627419
IncrementAsync(“SomeKey”);
27627420
IncrementAsync(“SomeKey”);
27627421

Called only once when the device is logged in.
Task<IOperationResult> IncrementAsync(string key);

please, help me for understand this situation.

thank you.

This is probably some other request / application changing the key - the server will only ever increment by the amount you ask.