Tags in liquid

I've got two lines as follows:
{% if OfferCount >= PageStart %}
{% if OfferCount < PageEnd %}The first is fine but the second generates an error - "Expected Tag Name, got something else instead". If I change the second line to:{% if PageEnd > OfferCount %}
it is fine, so it is easy enought to get round in this particular example, but is something which needs sorting.