[CentOS-devel] weird (non-functional) downgrade

dear devel

is this true that every rpm downgrade goes kind of a ... 
"haywire" ?

I've tried a few and...

  ~]$ yum downgrade ctdb
--> Running transaction check
---> Package ctdb.x86_64 0:4.4.4-9.el7 will be a downgrade
--> Processing Dependency: samba-client-libs = 4.4.4-9.el7 
for package: ctdb-4.4.4-9.el7.x86_64
---> Package ctdb.x86_64 0:4.4.4-12.el7_3 will be erased
--> Running transaction check
---> Package samba-client-libs.i686 0:4.4.4-9.el7 will be 
installed    <= ?????

~]$ yum downgrade bind
Resolving Dependencies
--> Running transaction check
---> Package bind.x86_64 32:9.9.4-38.el7_3 will be a downgrade
--> Processing Dependency: bind-libs = 32:9.9.4-38.el7_3 for 
package: 32:bind-9.9.4-38.el7_3.x86_64
---> Package bind.x86_64 32:9.9.4-38.el7_3.1 will be erased
--> Running transaction check
---> Package bind.x86_64 32:9.9.4-38.el7_3.1 will be erased
---> Package bind-libs.i686 32:9.9.4-38.el7_3 will be 
installed    <= ????

etc.
and system has no signle 686 rpm. Some kind of a curse my 
boxes suffer from? :)
b.w.
L.