Phone to Phone contacts not syncing:(

friends i am using iphone 5s and 6+ everyday, both are on 3g, LTE or wifi everytime, i used to add contact in one phone and it automatically sync to icloud and appears on another phone, but from last few days its not working, i have checked icloud settings and the contacts are on,
what i have noticed that if i add or edit anything in 6+ it appears on 5s, whereas if i add or edit on 5s it doesnt work on 6+
dont know what the hell is going on, Please help me out
Thanks

 

cynics, your way is manually, which is force sync, i am doing it daily, isnt there any permanent solution? like it was doing before?

 

didnt understand what u are saying

 

i purchased a new iphone 6+ 128 gb today and fresh installed everything, with the same id, its happening the same thing, old iphone 6+ is syncing contacts everywhere whereas if i add or edit any contact in new 6+ its not working automatically, i losted my mind what the hell is it

 

i have figured out something, let me explain it thoroughly, i have 2 iphone 6plus 128 gb,
lets give them a name old iphone 6+ is Primary, and the new one is secondary,
now here is the problem goes, when i add or edit any contact in secondary phone it appears in ipad and macbook but not on Primary iphone, if i force sync on primary phone it appears, now if i make a entry in contact in primary iphone it appears everywhere, dont know why Primary iphone not receiving automatically

 

i found the solution, in my primary iphone icloud settings i just turned off the contacts and switched it on, and now its working perfectly, hope others can try the same solution for other sync problems. Thanks