Which strategy are you using? And are you entering it in from automatic settings, and on your corporation list? Make sure both are set the way you want it.
Remember to input values if using a trail quality or fixed price.
In the corporation trade strategy is set at Time and Follow quality. In Automation it is only for the new corporation setting and it set at Time and follow quality.
Also, you may try to check your orders they are asking for best price, i set it at time base.
If you can't change it - it may be related to the best price mandated for new players. Not sure, you'd have to get someone more knowledgable than me to answer.