If you have the maximum nerd reached the castles will not produce any more nerds until they are deployd.
Ex if you have a max troop of 75 and already have 60 nerds and collect 20 from one castle you will "loose" 5 nerds as you've reached maximum, no new nerdicon will show after two hours unless you deploy some.
Nerd Production
Each Castle produces Nerds every Two hours
Base for each Castle is 5nerds/2h
On level 2 the Castle produces 10nerds/2h
On level 7 the Castle produces 15nerds/2h
On level 12 the Castle produces 20nerds/2h
On level 15 the Castle produces 25nerds/2h
On level 18 the Castle produces 30nerds/2h
If all Three Castles are on lvl 18 you'll get 90nerds/2h
Calculation examples:
if your Castles are at Lvl 10, 11 and 12 (15+15+20) you'll get 50nerds/2h
if your Castles are at Lvl 10, 15 and 18 (15+25+30) you'll get 70nerds/2h
Log in every 2h to collect and deploy Nerds for ultimate utilisation.
Max troop
The maximum number of Nerds a town can hold. When maximum is reached the number is displayed in red on the CastleOverview and you need to deploy Nerds (Raiding/Attacking) before more are generated. This might answer the question why no new nerds are produced, so check the Castle Overview if no Nerd icon is hoovering above the Castles after two hours.
Base is 40 max.
On level 3 the max troop is increased by 5
On level 9 the max troop is increased by 5 (total +10/castle)
On level 13 the max troop is increased by 5 (total +15/castle)
On level 16 the max troop is increased by 5 (total +20/castle)
On level 19 the max troop is increased by 10 (total +30/castle)
If all Three castles are on lvl 19 the max troop is 130
Calculation examples:
if your Castles are at Lvl 10, 11 and 12 (40+10+10+10) your max troop is 70
if your Castles are at Lvl 10, 15 and 19 (40+10+15+30) your max troop is 95
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