1)
the reinvestment will be in units, so is cash in or bonus
e.g. you cash in RM 1,000 on 16 April 2026 (1 unit = RM 1.2457)
= effectively bought 802.76 units (RM 1,000/RM 1.2457) in AHAM Enhanced Deposit Fund

assuming you received RM 10 bonus from Versa,
they credited RM 10 on 20 April 2026 (1 unit = RM 1.2461)
= your units will be increased by 8.03 (RM 10/RM 1.2461)
total units have been increased to 810.79

assuming you cash out RM 500 on 21 April 2026 (1 unit = RM 1.2463)
your units will be reduced by 401.19 (RM 500/RM 1.2463)
total units will become 409.60 (810.79 - 401.19), or equivalent to RM 510.48
therefore you have cash RM 500 + 409.6 units (RM 510.48)

2)
there are quite a number of quests so I have no idea of the bonus crediting timeline

3)
reinvestment is not return/interest
the concept is similar to dividends, it is paid out of what you have earned, so it does not create value
continue with the above example, your 409.6 units would be distributed RM 1.31 (409.6 units x RM 0.0032) on 23 April 2026
again, your units will be increased by 1.05 (RM 1.31/RM 1.2433)
so total units have been increased to 410.65 (409.6 + 1.05)
although your total units increased, the RM per unit has been decreased from RM 1.2463 to RM 1.2432 on 22 April 2026 (ex-date)

409.6 x RM 1.2463 = RM 510.48
410.65 x RM 1.2431 = RM 510.48 (NAV RM 1.2432 includes interest on 22 April 2026)

Conclusion, units increase then NAV will reduce. But the unit price at product information page always is the current market unit price right?

for reinvestment, yes

you mean this?

it would depend on your definition of current

yes, it's the latest known price but it's not in real-time