Cisco router with 3 spaces between `deny` and `icmp`

I was configuring deny icmp any any traffic when I realized it was not in the config.

I verified it with do sh run | i deny icmp command as follows:

R1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#

R1(config)#ip access-list extended 100 
R1(config-ext-nacl)#deny icmp any any 
R1(config-ext-nacl)#exit 
R1(config)#

For unknown reason, there are 3 spaces between deny and icmp and caused do sh run | i deny icmp command to fail.

R1(config)#do sh run | i deny icmp
R1(config)#

It turns out the config is actually there with 3 spaces between deny and icmp.

R1(config)#do sh run | i deny
access-list 100 deny   icmp any any
R1(config)#

What was the reason for this behavior?

Is this normal?