Supervision - 2-byte unsigned integer Object

[Fahd]

Hi, 

I have a 2-byte unsigned integer object that I have mapped from an AHU that works with Modbus TCP/IP, 
However, the object works totally fine only from the object list I can send/read the value and the ahu communicate with that perfectly  BUT it's not the case from the supervision interface, 
I have created several icons  and each icon will send a value  0,1,2,3,4  
press icon 1 will send 0
press icon 2 it should send 1 but when I press it  sends 4 ! 
icon 3 work fine 
icon 4 work fine 
icon 5 works fine 
As you can see in the attachment the icon should send a fixed value "1"

I'm totally an idiot, I deleted that icon more than 5 times before posting in the forum and each time I do not click on save  
Thank you.

Is there any limitation on the number of Modbus TCP/IP points that we could map?