What are the incentives in terms of percentage in HR policy of a comp

Query: I have joined an startup. And completed 6 months. The query is they had mentioned 60000 is my incentives which can vary 0 max. So max a month we can get is 5000. However it is probation period the company has assumed 2500 per month and given a total of 15000 at the end of six months. Without mentioning the reason. Later when i asked they told me we have mentioned 200% on the document and provided you 100%. Where my doubt is they have written 0-max how can they tell max is 200%. and deduct 2500 from the first 6 months compulsory.