The existing KeyValues in memstore are not removed completely after inserting cell into memStore

int versIionsVisible = 0;
...
if (cur.getTypeByte() == KeyValue.Type.Put.getCode() &&
            cur.getSequenceId() <= readpoint) {
          if (versionsVisible > 1) {
            // if we get here we have seen at least one version visible to the oldest scanner,
            // which means we can prove that no scanner will see this version

            // false means there was a change, so give us the size.
            long delta = heapSizeChange(cur, true);
            addedSize -= delta;
            this.size.addAndGet(-delta);
            it.remove();
            setOldestEditTimeToNow();
          } else {
            versionsVisible++;
          }