The MN limit has been temporarily removed.

The reasons for this being:

1) It's not currently protected against a DDOS attack. This makes it easy for someone to circumvent the limit, by spamming the network.

2)The majority of the community are not in favour of a node limit.

3) Worries about how the demand for the coin would fall because the incentive isn't there to buy a node.

Node governance is being implemented over the next few weeks. This will give people the opportunity to propose and bring back the limit in the near future.