Why MD volume same if different tick?

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arcull
160
arcull  
Hi there. The title says it all, if I sum up bid and ask volume on every tick for give instrument (EURUSD), I notice, that sometimes volumes in market depth are exactly the same. Why is that so? If new tick was triggered, that would mean that a deal was made at a different price then before, but that should influence MD a little, or am I wrong? Thanks
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