First you understand the legal meaning of LLP:
An LLP is a limited liability partnership where each partner has limited personal liability for debts or claims of the partnership. Partners of an LLP aren't held responsible for the acts of other partners.
LLP is a type of Partnership where the partners have limited liability for the debts and obligations of the business. If the company incurs debts or legal action, the partners' assets are not at risk.
You have an offer letter and are being paid salary by one of the partners, hence you cannot question the authority in this type of firm.
If you have any issue on this arranegement you can either clarify or quit the company stating that the things are not going the legal way