Incorrect incursion timer on time limited Zana's map

I opened and entered Burial Chambers map. Then I found Zana and I entered another Burial Chambers map (Zana’s mission, lodestones or just time limited – I can not remember). Next (on Zana’s BC map mission) I found Alva and opened incursion. There were no timer but when my character killed a group of enemies timer of BC map was copied into incursion. This is only display bug, the correct incursion timer was active as when I stayed there for some time my character was kicked out according to real incursion timer.